Vacuum reservoir / tank. Porsche 993 / 996 / 986 Boxster / 991 GT3

Vacuum reservoir / tank for air injection system.
This a high-quality replacement reservoir stores vacuum created by the engine or vacuum pump, providing a steady supply of vacuum to systems such as brake boosters, emissions control, and actuators even under engine load or varying vacuum conditions. It’s moulded from durable plastic with designed internal volume, mounting bosses, and port locations matching the original Porsche part (replaces 99311014002 / 99311014003 / 0PB129093).

Fits:
Porsche 993 Carrera 1994-98 (Engine: 6405 / 6406 / 6407 / 6408)
Porsche 993 Turbo 3.6L 1994-98 (Engine: 6460)
Porsche 996 Carrera 1998-05 (Engine: 9601 / 9602 / 9604 / 9603)
Porsche 996 Turbo 2001-05
Porsche 996 GT3 / GT3 RS 1999-05 (Engine: 9676 / 9679)
Porsche 986 Boxster 2.5L 1997-99 (Engine: 9620)
Porsche 986 Boxster 2.7L / S 3.2L  2000-02 (Engine: 9621 / 9622 / 9623 / 9624)
Porsche 991 GT3 2014-21

Diagram ref no 6

Engineered to OE standards, this unit replicates the original shape, mounting points, port alignment, and internal volume. Its material resists heat, oil vapor, and pressure cycling to provide reliable vacuum buffering over long-term use.  

Over time, the vacuum reservoir can crack, leak, or lose internal sealing, leading to:
•  Reduced braking assistance
•  Malfunction of intake or exhaust actuators
•  Check-engine lights caused by vacuum faults
•  Rough idling or loss of power under load

Replacing the vacuum reservoir restores full vacuum stability and ensures proper operation of all connected systems. This is especially important when diagnosing brake booster failures, emissions issues, or vacuum leak codes.


Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

0PB129093

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